Page 171 - Open-Hole Log Analysis and Formation Evaluation

a
to
dip
the
the
and
back
ships
idea
An
until
using
well)
bed).
the
to
The
FIGURE
it
is
values,
placing
stereo
azimuth
Either
If
the
same
same
to
increased
8.6
structural
in
transverses
was
understand
the
stuck
the
dip
the
perform a
of the
time,
subtraction.
meter-related
angle
illustrated
the
the
net with
cosine
alternative
of these
to
horizontal
a
horizontal
in
dip
consider.
practicing
cheese
vertical,
The
law
cheese
SPWLA from Bateman
through
orientation
(or
pencil
and
of dip
in
is
a
log
cheese
to
the
on a
subtraction
principle
rotating
figures
increase
the
rotations
problems
approach
from
the well
rotation.
geographical
slab
relative
by
which
as
8.4
and
the
hole
can
In
some
will
well
to
west
of
and Konen
initially
analyst
of spherical
be
deviated
the
manipulation
would
one
overlay,
and
case
to
frame
this
the
back

to
or
point
horizontal
be
1979,
of
can
dip
who
8.5
the
it
bed
made
cheese
deviation
imagining
to
be
dipping
the
deviation
west
solution
a
triangles.
can
can
by
has
appreciate
method
,
to
vector
surface
itself.
be
and
be
cheese
of the
allow
made
somewhere
the
the
to vertical),
west,
had
reference,
Once
pencil
and
The
will
slab
the
the
of north.
north
treating
to
used.
bed
described
the
the
north
it
pencil
then
be
is
(representing
azimuth
while
as
and
to
reader
deal
bed
a
the
would
pencil
here.
Since
simple
similarity
from
the

bed.as
the
of west
to
dip
the
Deviated Well and Dipping Bed. Reprinted by permission
The
brought
with
assume
:
move
(representing
result
at
and,
vertical.
is.rotated
relation-
new
graphically by using
rotate
an
made mathematically
structural
the
at
pencil
dipping
dip-
maintaining
new
of
another
basic
may better
back
between
of the

the

a.
d.
c.
b.
to
is
ee
or
or
cos
TST
TST
tor
and
Top
TST
Bed
TVT
then
Qo
TVD
Well
Find
given
If the
From
a’
= | DAZ 5 HAZ? B a horizontal. For which Wellbore needed \ Deviated azimuth 157 8. RESERVE OF RESULTS. AND APPLICATION OF ANALYSIS I. METHODS 1D0
is
=
=
=
i well II the approach is the of the
is
the
Bottom
=
=
the
by
bed
=
the
bed
Measured
QUESTION
MT
MT
MT
=
of bed.
of bed.
true
is
dip
horizontal
bed
cos
log
well
‘COS
hole
of bed
#8.3
dipping
difference
deviated
ist
a
| 25° 30° to azimuth =! 5878 ft 5642 the following data [cos a - sin @ tan B B vertical [cos cos now- horizontal, the @ COS B - sin w sin is deviation from measured bed thickness, azimuth, and azimuth, dip from horizontal, deviation from Thus, if purposes is new bed dip or the bed or the hole ESTIMATION
a’
ft
thickness.
given
to
cos
of
used.
B
by
between
-
"
a’,
top
sin
thickness
azimuth
a
and
-
45°
where
illustration,
sin
cos
are
of the
128°
B
bottom
bed
cos
(HAZ
is
-
will
collected:
a true stratigraphic bed thickness is B cos (HAZ - DAZ), (8.5) bed has been rotated vertical after the vertical, a we new hole deviation, depending on is not required, the only parameter .
(HAZ
of bed.
-
given
rotate
DAZ)).
by
the
DAZ)|
bed
back
\
to
(8.7)
(8.8)
(8.9)
(8.6)

|